Q. What is the next number of the following sequence
1. 4, 5, 8, 27, 104, 525, _______
Option
a) 3515
b) 3530
c) 3144
d) 3324

2. 9, 17, 37, 75, 137, 229, _________
a) 357
b) 331
c) 323
d) 337

3. 5, 12, 24, 36, 52, 68, __________
a) 84
b) 82
c) 86
d) 78

4. 11, 31, 71, 91, 32, 29, 13, _______
a) 73
b) 37
c) 79
d) 17

5. 480, 240, 160, 120, 96,________
a) 80
b) 76
c) 64
d) 60

6. 34, 43, 77, 84, 93, 177, 186, 203, _________
a) 391
b) 389
c) 373
d) 401

7. 3, 1, 13, 11, 31, 29,________
a) 51
b) 63
c) 61
d) 57

8. 72, 46, 521, 612, 343, _________
a) 512
b) 729
c) 927
d) 215

9. 16, 8, 8, 12, 24, 60, 180,_____
a) 610
b) 630
c) 720
d) 650

10. 14, 17, 50, 25, 29, 85,________
a) 91
b) 93
c) 89
d) 87

• 1)4, 5, 8, 27, 104, 525, __
  4*1+1=5
  5*2-2=8
  8*3+3=27
  27*4-4=104
  104*5+5=525
  525*6-6=3144
  c) 3144
  
  2) 9, 17, 37, 75, 137, 229, x
  1st diff betn two => 8,20,38,62,92,128 [92+36]
  2nd diff => 12,18,24,30, 36
  so, x= 229+128 = 357
  a)357
  
  3) 5, 12, 24, 36, 52, 68, x
  
  5 = 2 + 3
  12 = 5 + 7
  24 = 11 + 13
  36 = 17 + 19
  52 = 23 + 29
  68 = 31 + 37
  x = 41 + 43 = 84
  a)84
  
  4) 11, 31, 71, 91, 32, 29, 13,
  prime no.s from 11 onwards written in reverse
  11, 13, 17, 19,23,29,31, 37
  
  37 rev = 73
  a)73
  
  5) 480, 240, 160, 120, 96, x
  480=240*(1+1)
  240=160*(1+ 1/2)
  160=120*(1+ 1/3)
  120=96*(1+ 1/4)
  96=x*(1+ 1/5) => x= (96*5)/6 = 80
  a)80
  
  6) 34, 43, 77, 84, 93, 177, 186, 203, x
  (34, 43, 77), (84, 93, 177), (186, 203, x)
  34+43=77
  84+93=177
  186+203= x => x=389
  b) 389
  
  7) 3, 1, 13, 11, 31, 29, x
  (2+1),(2-1),(12+1),(12-1),(30+1),(30-1),(x+1),(x-1)
  where, 2,12,30,x
  1^2+1=2
  3^2+3=12
  5^2+5=30
  7^2+7=56 => x=56
  next two no.s of series (56+1)&(56-1) i.e. 57 & 55
  d) 57
  
  
  8) 72, 46, 521, 612, 343, x
  3^3=27 reverse = 72
  4^3=64 rev= 46
  5^3=125 rev = 521
  6^3=216 rev = 612
  7^3=343 rev = 343
  8^3=512 rev = 215 = x
  d) 215
  
  9) 16, 8, 8, 12, 24, 60, 180, x
  16*.5=8
  8*1=8
  8*1.5=12
  12*2=24
  24*2.5=60
  60*3=180
  180*3.5=630 = x
  b) 630
  
  10) 14, 17, 50, 25, 29, 85, x
  14=1^2+4^2=17
  17=1^2+7^2=50
  50=5^2+0^2=25
  25=2^2+5^2=29
  29=2^2+9^2=85
  85=8^2+5^2=89
  c) 89
  
• 10 years agoHelpfull: Yes(167) No(2)
• but in 5th questn 29 is not in reverse...remaining all k
• 10 years agoHelpfull: Yes(14) No(0)
• great work rakesh...tq..:)
  
• 10 years agoHelpfull: Yes(11) No(0)
• all are the reverse of each cubes
  3*3*3 = 27 =>72
  4^3 = 64 =>46
  5^3 = 125 =>521
  erokom kore egobe...
• 10 years agoHelpfull: Yes(1) No(0)
• 1.the series goes like 4*1+1,5*2-2,8*3+3,27*4-4,.........so the answer is 3144(525*6-6)
• 10 years agoHelpfull: Yes(0) No(2)
• Q:1
  4*1=4+1=5 5*2=10-2=8
  8*3=24+3=27 27*4=108-4=104
  104*5=520+5=525 525*6=3150-6=3144
  Ans:3144
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